Electrically-heated igniter



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H. E. BRIGGS I ELEGTRICALLY HEATED IGNITER original Filed Feb. 17. 1925 u IAYIIIIIIIIII. a

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Patented Dec. 7, 1926.

UNITED STATES HARRY E. BRIGGS, OF ANDERSON, INDIANA.

ELECTBICALLY-HEATED GNITER.

Original application nled February 17, i923. Serial No. 619,616.y

November i925.

This invention relates to an igniter for oil engines.

The vchief object oit' the im'ention is to provide an igniter tor heatingl the i'uel sup* plied to an oil engine particularly when starting the saine to insure ignition ot the combustible mixture, and at the same time so construct the igniter that the heat generating portions are adequately,v protected `troni the ssivc pressure, heat, or strains resultant m an oil engine.

The chieif`r feature olf the invention consists in the formation ot an inniter from a heat resistant, heat t-ranst'errino metal casing` enclosing and protecting a heating` element, which' heatingv element may or may not he suitably supported within said casing by suitable insulation.

'lhe full nature ot the invention will be understood from the accompanying drawings and the tollowing` description and claims:

In the drawings Fig. l is a longitudinal sectional view oi one form ot heating' plug. Figi'. 2 is an end view ot the saine. 3 is a transverse sectional view taken on line D 9 of Fig. l and in the direction ot the v c) arrows. Fig. et is a longitudinal sectional view et anotlier torni ot heatingl plug. Fi

5 an end view ot the saine. Fis'. (i is a longitudinal sectional view oil" a still further torni of' heat-ingl plug. Fig'. i is an end view thereof. Fig'. 8 is a longitudinal sectional view ot still a further forni of heating;` plug'. Fig. 9 is an end view ot the same.

The invention disclosed herein is a division in part ot' that disclosed in co-pending application Serial No. 619.616. l'iled February 17, 1923, entitled Heater system tor oil engines and the invention as disclosed in Figs. i to 5 inclusive, is the same as disclosed in Figs. 1l to 13 and it and i? of the before mentioned copending;` applica-` tion. Additional inodied forms ot the invention are shown in Figs. 6 to 9 inclusive.

In Figs. l. 2 and 3 there is illustrated one torni of the'heater plug. rihe plug' 20 is hollowed out as at 79 and a seat SO is provided at the closed end of said hollowed out portion. an externally tapered and threaded portion Si, whereby said plug is rigidly secured in a cylinder head opening. The body portion The enlarged body port-ion 2i has nivided'ami uns application inea serial No. 69.390.

is cut away as at 82 and 83 and irrooved as at 84 adjacent to the enlargeiil opening Sii. Extending' axially through the hollowcd body is an insulating core which .is adapted to stand up under high temperatures. particularly within the rai'ig'e ot 50() to i500 degrees Fahrenheit. The connncrcial product lava satisties this condition and will approximately withstand i000 degrees bci'ore disintegratine'.r The suri'ai'e no ot core 85 is threaded, and positioned in said threads, is a wire 8T which constitutes a resistance unit. Said wire terminates adiacent the 'tree/end in a. lead portion (L58 positioned in a slot 8S) which communicates with an axial hole 90 through the insulator body portion 85 and the axial opening' 9() receives the connection 91. The space between the. core carrying the resistance unit and the Wall of the chambers 'T9-821m herein shown filled with an insulating compound The end ot the core S'opposite trom the slotted end 89 is herein illustrated as provided with three projecting' portions 93 which are receivable by the chamber 82 and serve to center the outer end ot' the coreS, whereas 'the other end ot' the core 85 is centered by reason of the conical end 80. The wire 8T and the lead 91 are brought out through' the holes 94, see Fig.l 2. cut in an insulating' plugv or disk 95 seated in the enlarged portion 89, ot the axial opening'in the plupfbody, insulated disk or plate is retained inposition by means ofthe spring'v clip ringl 9o seated in the groove 84e. The disk 95 supports a pair ot' terminal posts 97 and these' each are secured to one et' the heating unit terminal wires S7 or 91 by means ot the nut 9S while the external connector 9) secured' citic heat and high resist-ance to Conductiono'l" heat. This has been 'found to be the most desirable in a heating unit which is subjected to the high temperatures toundiin a' crude oil engine when the latter is operating'.

In Figs. 45 and 5 there 1s illustrated a furtherandmodiiied form of heater plug,v and.

The

herein the plug body comprises a tubular portion 170 having a closed end 171 with a conical seat 172 therein. The tubular portion 170 at its opposite end terminates in an externally threaded and tapered portion 173, which is enlarged at 174 to form a tool receiving portion and herein said portion 174 is shown as hexagonal in form. The portions 173 and 174 are hollowed out at 175 and internally threaded as at 176. Extending axially through the hollowed body is an insulating core 185 which is adapted to stand up under high temperatures as aforesaid. The surface 186 of the core is externally threaded and diii'ers from the portion 86 previously described, in that it has a double thread. The wire 187 is positioned in one of said threads and runs from one end ot the thread to the opposite end, and thereupon passes through the core by passing through the opening' 189 which provides a communication Yfrom one ot the threads to the other thread. The wire 187 thus passes down one thread and returns up the other thread.

' v The end of the core 185 opposite the conical end 180 is enlarged at 183 and is threaded externally so as to be receivable by the threads 176 of the plug wall. Thus the core at this end is centered within the tubular heater body, while the other end of the core is centered by reason of the conical end 180 engaging the conical portion 172 of the plug body. The wire 187 is brought out through the openings 194 in the enlarged portion 183, which supports a pair of terminal posts 197 having a threaded engagement therewith. Said posts support the nuts 198 for securing the terminal ends of the wire 187 thereto. The thumb nuts 200 are adapted to secure the external connectors 199 to the terminal posts. Herein the core is shown centrally apertured but if desired this longitudinal opening 190 may be omitted.

In Figs. 6 and 7 a modified form of the invention is illustrated, in which form the body portion 270 is hollowed out and includes a smaller chamber 272 in the closed end 271. The insulation core or support 285 includes a central' axial opening 290 receiving the lead in wire 291. Said lead in wire extends downwardly through the central opening and is positioned in the coils 287 upon the threaded suriace 286 of the insulation core 285. The end 280 of the core 285 is receivable by the chamber 272 for centering purposes, the conical faces'o'f the chamber and the extension seating for centering purposes. The opposite end of the core is enlarged as at 293 and said core is retained in position by a tapered screw 283 seatable in the registering openings 284 formed in the body 274 and core 285. The plug as usual is provided with a tapered external thread and a tool engageable portion 274. The wire terminals 297 are employed tor supporting the external wires 299 and for The type shown in Figs. 1 to 7 inclusive,

are of the relatively high voltage type, that is suitable for 110 and 220 volts pressure. rlhe type shown in Figs. 8 and 9 is of the low voltage type and as a consequence the resistance unit is of a more rugged construction than that shown in Figs. 1 to 6 and therefore does not have to be supported. The same core can be utilized. In this form of the invention the longitudinal lead in wire 391 forms a central support or stiener for the concentric coils 387 of the resistance unit. The terminal portions 400 are suitably supported in an insulation block 393 suitably secured in the chamber 375 formed within the plug having the tapered external thread 373 upon the body portion 370. The end 371 of the plug is closed as in the other forms. The insulation block or plug 393 supports the usual terminal construction indicated generally by the numeral 397 and the supply lines 399.

The invention claimed is:

1. A heater comprising a metallic hollow body having a low specific heat and high resistance to heat conductivity, and a lava insulating core within the hollow body, and electric heating means supported by said core within said body.

2. A hollow metal body closed at one end, an insulation core positioned in said hollow metal body and supported at one end therein by the closed end of said body and supported and retained within said body at the other end thereof, said core having a threaded periphery, and electric heating means positioned on said core in said threaded portion.

3. An igniter for an oil engine comprising a hollow metal plug having a tool engageable portion at one end and an externally threaded portion adjacent thereto and a closed opposite end, a resistance coil positioned within said body, and an insulation block oppositely positioned from the closed end for supporting the terminal portions ot said resistance coil.

4. An igniter for an oil engine comprising a hollow plug for an oil engine comprising a hollow plug body having a tool engageable portion at one end, a threaded portion adjacent thereto and a closed opposite end, a resistance coil within the plug body, and an insulation core for supporting said coil and having one end associated with the closed end of the body for centering said insulation core, said core having an enlargement upon the opposite end for centering the other end thereof.

In witness whereof, I have hereunto aftixed my signature.

HARRY E. BRIGGS. 

